Warp-cutting device for use in pile-fabric looms



Dec 16, 1924. 1,519,756)

I J. ASHMORE ET-AL WARP CUTTING DEVICE FOR USE IN FILE FABRIC LOOMS Filed June 8, 1923 ATTORNEYS.

Patented Dec. Fifi, 1924.

WARP-CUTTING DEVICE FOR USE IN FILE-FABRIC LOQMS,

Application filed June 8, 1923. Serial No. 844,091.

To all whom it may concern:

Be it known that we, JOHN Asnmonn and GEORGE Asnmonn, both citizens of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Warp-Cutting Device for Use in Pile-Fabric Looms, of which the following is a specification.

Our invention relates to a class of devices employed to sever the warps of woven fabrics out of which velvet, Axminster or Wilton carpets, for instance, or other pile fab rics, are made, and which is variously termed, in the shop as a carpet wire, and, in untechnical language, as a cutting knife.

Confining ourselves to the expression cutting knife, It is to be explained that in pilefabric looms a plurality of these cutting knives, identical with each other, is used, and that their curved cutting edges are drawn through the warps by various devices, the knives, from a normal plural placement in the'loom, being one by one drawn through the fabric, and each, after it has done its work of cutting the warps, being returned to its original position.

As these knives have heretofore. been formed, it has been necessary to constantly v sharpen their cutting edges, sometimes very frequently indeed, in order to prevent the tearing of the yarn resulting in practice from the operation of these knives when their blades are dull.

It is the object of our invention to lessen and almost wholly overcome the tendency of these blades quickly to become dull, and this object we attain by the simple expedient of cutting an oblique slot into the outwardly and upwardly extending curved cutting edge of the blade of the cutting knife as an entirety,the knife being otherwise similar in general characteristics and formation to those which for many'years have been in use in the art of making pile fabric.

It should be further explained that our invention resides essentially in this construction of the cutting blade of the cutter, and that in order to effectuate the mounting and reciprocatory movement of the cutters across the fabric and lengthwise of the loom, a loom the framework of which may be of any conventional or desired-construction, and a means for reciprocating the cutters one by one along said framework similarly of any preferred construction operative to the end in view, are to be employed.

With the above and other objects in view our invention comprehends a novel construe tion of a knife which is weakened in proximity to the cutting edge, in order to pro vlde a resilient portion and this weakening may be accomphshed in many different ways.

For the purpose of illustrating our inventlon, we have shown in the accompanymg drawings embodiments thereof which are at present preferred by us, since these embodiments will be found in practice to give satisfactory and reliable results. It is, however, to be understood that the various instrumentalities of which our invention consists can be variously arranged and organized and that our invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

. Figure 1 represents, in side elevation, a loom in conjunction with which cutters, embodying our invention, are employed.

Figure 2 represents a fragmentary per spective.

Figures 3 and 4 represent, respectively, perspective views of different embodiments of our invention.

Similar numerals of reference corresponding parts.

Referring to the drawings.

1 designates a loom framework of any indicate preferred character and 2 a cutter-carrying bed upon which are mounted our cutting knives 3, one of which detached is illustrated in Figure 3, and any desired plurality of which as mounted is illustrated in Figure 2.

. As a convenient means for effecting the reciprocation or end-for-end travel of a slide 4 along the slide-way 2, we use the following connective gearing.

6 designates a pair of fast and loose pulleys suitably mounted upon a driving shaft 7, a pinion 8 on the free end of which shaft engages with a spur wheel 9 on a driven shaft 10 suitably mounted on the framework and having at its free end a driving bevel gear 11 in engagement with a driven bevel gear 12, which being connected with a disc on which is an eccentric pin 13 serves as an eccentric,an eccentric rod 14 making connection with the lower end 15 of a bellcrank lever 16, the upper end of which is by a link 17 connected with the slide 4,

Obviously, when the driving shaft 7 is caused to rotate, through the pinion 8, the

1 cutting knives is through a book 18 pivoted to the slide 4: and adapted to engage with the hook recesses 19 near the end 29 of the cutting knife 3, as particularly illustrated in Figure 3.

All of the foregoing operative devices being usual in looms of this character require no further description, but it may not be improper to explain that after each cutting knife has in turn been drawn through the warps, it is moved laterally across the cutter-carrying bed 2, conveniently by the properly timed operation of what we term a replacing hook 20, mounted on the free end of a transverse bar 21, which moves through a slide bearing 22 mounted on the framework and is caused so to move through connection with the upper end of a rocker arm 23 pivoted at 24, the lower end of which arm travels upon a cam'25 mounted upon a cam shaft 26 housed in the framework and driven by a toothed pinion 27 in engagement with the spur-wheel 9, and that thereafter said cutting knife will be returned toits normal position in the plurality of knives.

28 designates the usual take-u roll for the fabric which is to be operate upon.

Repeating the statement that the above described loom framework and means for reciprocating the cutters, are typical merely of devices in general use for the purposes mentioned, and that other means operating to support and actuate the cutters may in their stead be employed, the cutting knife, or carpet wire as it is technically called and which is illustrated in Figure 3, is the device in which our invention primarily resides and is of the following construction:-

A long shank designated by the number 3 terminates at the rear in the base or buttend formation designated 29, the peculiar outlining of which is well understood by those skilled in the art and need not, therefore, be specifically described except to say that it necessarily embodies the hook recess 19 into which the hook 18 on the side 4 is entered to effect the pull upon the cutter.

The advance end of the cutting knife is, however, formed into the usual outwardly and upwardly-extending curved cutting blade which we have designated 30, the sides of which are oppositely curved inwardly to the cutting edge designated 31, so that Viewed in transverse section the cuttin blade presents, in a sense, the curvature 0 an old-fashioned razor blade.

It is the essence of our invention to weaken the knife or cutter in proximity to its cutting edge so that the cutting portion will have a desired amount of resiliency.

In Figures 1, 2 and 3, this is accomplished by forming a slit or slot 32 which is disposed substantially parallel with the bottom face of the cutter and at one end termi nates in proximity to the cutting edge.

In the embodiment seen in Figure 4, the cutter 33 is provided with a slot 34 which at its far end terminates in an aperture.

In all the embodiments of our invention as herein shown, we form in proximity to the cutting blades a weakened'portion so that the portion of the cutter which carries the cutting edge will have a desired amount of resiliency, This obviates the necessity'of frequent removal of the cutters in order to sharpen them, as it will be found in practice that a cutter constructed in the manner herein shown will not need to be frequently sharpened so that it is not necessary to frequently stop the loom' in order to sharpen the cutters.

It will now be apparent that we have devised a new and useful warp cutting device for use in pile-fabric looms which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while we have, in the present instance, shown and described preferred embodiments thereof which will give in practice satisfactory and reliable results, it is to be understood that these embodiments are susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is

1. A pile-wire having a blade, the cut-ting edge of which extends in a rearwardly direction, said blade'having a slotted portion the slot of which extends in a substantially parallel manner with the bottom face of the cutter and terminates at one end in proximity to said cutting edge but does not intersect said cutting edge.

2. A pile-wire having formed integral therewith a blade, the cutting edge of which extends in a rearwardly direction, said blade having a slotted portion the slot of which extends substantially parallel with the bottom face of said cutting blade and terminates at one end in proximity to the cutting edge without intersecting the same to provide a relatively flexible rear cutting portion.

JOHN ASI-IMORE. GEORGE ASHMORE. Witnesses:

RALPH H. GAMBLE, WM. D. DowNEr. 

